Mobile Preview -> AutoLandscape Material broken if created in 4.22+

Landscape Layers created in 4.22+ revert to default material in Mobile Preview.

Confirmed in MAIN at CL 9730599

2 sample projects attached - TestPrj - User created 4.23 project that showcases the issue and AJ_LandscapeAutoMat a 4.21 project that can be updated and requires additional steps to reproduce the issue.

1. Create Material function MF_Layer - Create Vector 3 input (BaseColorInput) Feed through MakeMaterialAttributes to Output
2.Create auto-layer material (graph pictured)
3. Create landscape, assign material
4. Create Weight blended layer in paint mode (IF UPDATING THE PROVIDED 4.21 PROJECT: Delete and recreate this layer, rebuild lighting and restart editor)
5. Enable Android-> Support OpenGL ES3.1
6. Change preview mode to ES3.1 Preview (Or iOS)

Result: Material will show checkerboard pattern